I was taking 60 mg IR of Adderall per day, but that just wasn't cutting it. What needed to be done was upping my dose to 90 mg. My doctor doesn't like to go above 60 mg so we decided on something else. He started me on 80 mg Vyvanse per day with 20 mg IR Adderall as a PRN. I've never taken Vyvanse so here will come the onslaught of questions. What can I expect from the switch? Will there be a noticeable difference in effectiveness between the two? Is Vyvanse like Adderall where if you drink too much vitamin C or ascorbic acid it nullifies the effects? How long does Vyvanse usually last for? Is Vyvanse better than Adderall XR (I have tried Adderall XR, didn't last as long as I would have hoped it would). I guess I'm just looking for any answers to all the questions anyone could think of when switching from Adderall IR to Vyvanse. Thanks a bunch group and I hope all is well.